Number of functions f:{1,2,...,n}->{1,2,...,n} such that each component of f is a function on an interval of {1,2,...,n}.

A219530

Number of functions f:{1,2,...,n}->{1,2,...,n} such that each component of f is a function on an interval of {1,2,...,n}.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =24a(4) =195a(5) =2046a(6) =26752a(7) =422546a(8) =7849611a(9) =167781117a(10) =4054557471a(11) =109246333917

External references